ajax开始未请求数据之前与之后的函数

_articleIndex : function(page){
$.ajax({
url: window.location.href,
type: 'POST',
async : false,
dataType: 'json',
data: {page : page},
beforeSend:function(XMLHttpRequest){
$('.downld').show();  //之前
},
success : function(data){
var list = data;
console.log(list);
if(data.status == 1){
$('.articleindex').append(template('articleindex', data));
$('#page').val(page);
if(data['data'].length < 10){
$('.downld').hide();scrollstatus = 0;
$('.articleindex li:last a').css('border-bottom', 'none');
}
}
},
complete:function(XMLHttpRequest,textStatus){
$('.downld').hide(); //之后
},
});

},